Flapjack is an excitable, adventure-loving boy who was raised by Bubbie, a talking whale. Despite her warnings, Flapjack is spellbound by K'nuckles' stories and longs to become a real adventurer.

K'nuckles is a washed-up, old sailor who claims to be the greatest pirate the world has ever known. He's always telling outrageous tales and getting Flapjack wrapped up in his high seas hijinks.

The motherly whale Bubbie prefers the safety of Stormalong to the dangers of the open seas, but she's always there for Flapjack, no matter what kind of trouble K'nuckles gets him into.